Details

Autor(en) / Beteiligte

• Wang, X
• Hilton, D J
• Reno, J L
• Mittleman, D M
• Kono, J

Titel

Direct measurement of cyclotron coherence times of high-mobility two-dimensional electron gases

Ist Teil von

• Optics express, 2010-06, Vol.18 (12), p.12354-12361

Ort / Verlag

United States

Erscheinungsjahr

2010

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We have observed long-lived (approximately 30 ps) coherent oscillations of charge carriers due to cyclotron resonance (CR) in high-mobility two-dimensional electrons in GaAs in perpendicular magnetic fields using time-domain terahertz spectroscopy. The observed coherent oscillations were fitted well by sinusoids with exponentially-decaying amplitudes, through which we were able to provide direct and precise measures for the decay times and oscillation frequencies simultaneously. This method thus overcomes the CR saturation effect, which is known to prevent determination of true CR linewidths in high-mobility electron systems using Fourier-transform infrared spectroscopy.